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Finding the Fourth Proportional to 739.84, 1,020.64 and 429.28

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Solution

The fourth proportional to 739.84, 1,020.64 and 429.28 is: 592.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.84 : 1,020.64 = 429.28 : x
  2. Step 2: Convert to fraction form
    739.84/1,020.64 = 429.28/x
  3. Step 3: Cross multiply
    739.84x = 1,020.64 × 429.28
  4. Step 4: Simplify right side
    739.84x = 438,140.34
  5. Step 5: Solve for x
    x = 438,140.34/739.84
  6. Step 6: Final answer
    x = 592.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.